High Voltage PFT Series, Инструкции по безопасности, эксплуатации и процедурам

Страница: 11 / 29

8
* * * C A U T I O N * * *
P O T E N T I A L L Y L E T H A L V O LT A G E S
M A Y B E P R E S E N T
8.
With the OUTPUT control at zero (zero start interlock engaged), depress the HV ON
pushbutton. The HV ON light will glow.
9.
Increase the output by rotating the OUTPUT control slowly clockwise until the desired output
voltage is reached.
Note: The high voltage output cable shield is grounded. This grounded shield appears as a
load even under ‘no load’ conditions. The current on a PFT-503CM is about 18mA at full
output with the RETURN MODE in the GROUND position.
10.
Maintain the output voltage for the test time specified in your standard procedures.
11.
After the test is complete, rotate the OUTPUT control to zero, prior to depressing the HV OFF
pushbutton.
12.
If the test sample fails during the test, the internal overload relay will de-energize the high
voltage. This relay is in the primary circuit and is sensitive to primary current overloads.
The overload is set to 120% of the rated current of the variable transformer. The use of a
gapped transformer in the high voltage tank will null the primary currents (up to 1.5 KVA) and the
overload will allow operation to the full output rating of 3 KVA. When testing purely resistive
loads, the unit will overload above 1500 VA of input power to the tank.
13.
Prior to removing the output cable from the load, observe that the output voltmeter is at zero.
14.
Always ground the output cable (or toroid) and test sample prior to disconnecting the
test object.